package project.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

public class BackServletFilter implements Filter {

    public void destroy() {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;

        String contextPath=request.getServletContext().getContextPath();
        String uri = request.getRequestURI();
        uri =StringUtils.remove(uri, contextPath);

        if(uri.startsWith("/admin_")){
            String servletPath = StringUtils.substringBetween(uri,"_", "_") + "Servlet";
            String method = StringUtils.substringAfterLast(uri,"_" );
            request.setAttribute("method", method);
            req.getRequestDispatcher("/" + servletPath).forward(request, response);
            return;
        }

        chain.doFilter(request, response);
    }

    public void init(FilterConfig arg0) throws ServletException {

    }
}